Snap switch



V. BUNYEVACZ SNAP SWITCH. FILED FEB. 9, 922.,

Feb. 6, 1923.-

VIKTOE BUIIYEVACZ, 0F BUDAPEST, HUNGARY, ASSIGNOR, BY MESNE ASSIGNMENTS,

9F ONE-HAL TO ALEXANDER ROMAN, 01" YORK, N.

SNAZ" SVITCH.

Application filed February 9, 1922. Serial No. 535,283.

To all cello m, it may concern:

Be it known that I, Vrnron Bonrnviioz, a citizen of Hungary, and resident of Budapest, Hungary, have invented certain new and useful Improvements in Snap Switches, off which the following is a specification.

The present invention relates to improvements in electric switches, and more particularly to snap-switches.

The main object of the invention is to pro duce a snap-switch which is simple in con struction. Slilcltlltin operation, durable in use, and the elinents of which are so constructed and arranged that they are not subjected to undue jars and wear in use.

Another object or the invention is to so construct the switch that its contact making shiftable eiemcnt is efi ectively prevented. from resting in any halfway position and thus from establishing an arc.

\Vith these and other objects in view, which wiil more fully appear as the nature of the invention is better understood, the same consists in the combination, arrangement and construction of parts hereinafter described, pointed out in the appended claims and illustrated in the accompanying drawings, it being understood that many changes may be made in the size and proportion of the several parts and details of construction within. the scope of the appended claims, without departing from the spirit or sacrificing anyo'f the advantages of the invention.

Two of the many possible embodiments oi the invention are illustrated in the accompanying drawings, in which Figure 1 is a plan view of a switch constructed in accordance with the present invention, its cover being removed to show the interior construction; Fig. 2 is a section. taken on line 2-2 of Fig. 1, with the cover in place; Fig. 3 is a view similar to the one shown in 1 of a modification of the invention; and Fig. t is an elevation of one of the stationary contact points employed in the device shown in Fig. 3.

Referring now first to Figs. 1 and 2 of the drawings, the numeral 10 indicates a casin provided with a cover 11. Both the casing and cover are, preferably, made of insulatinn material may be of any suitable configuration. In the case illustrated, the cover is cylindrical and provided upon diametrically opposite portions of its cylindrical wall with apertures 12, through each 0t which projects a push button 13, said buttons being either made integral with or attached to a bar l i,v that is centrally provided with a transverse lot 15. Through this slot extends a rock-lever 16, pivoted at 17 to a lug 18. This lug is made integral with one oi? the stationary contact points, denoted by the numeral 19, said contact point being held, for instance, by a screw 20 upon the bottom 21 of the casing. This contact point is arranged at one side oi. the lever, the other stationary contact point, denoted by the numeral 22, being disposed at the other side of said lever. The contact point 22 is made in the form of a spring, for a purpose hereinatter to be described.

The rock-lever is provided adjacent the fulcrum 17 with three wedge-shaped teeth 23, adapted to co-operate with a wedgeshaped projection 2e on a blade spring 25, the latter being attached in any suitable manner to the bottom of the casing 10.

The operation oithis device is as "follows: l Vhen the elements are in the positions; shown in full lines in Figs. 1 and 2 of the drawings, the projection 24 on the blade spring is seated between the middle tooth and the right-hand side tooth on the rocklever, in which position the latter contacts with the stationary contact point E22, estab lishing thus a connection between the two stationary contact points of the switch. n order to break the circuit, the bar 1.4L is shitted in the direction of the arrow shown in 1 of the drawings, wherebv first the middle tooth on the rock-lever lorces the projection 24: out of the gap between said two teeth and thereby places the blade spring under tension, the lug 24 on the latter jumping into the gap between the middle tooth and. the left-hand side tooth. on the rech lever, as soon as the latter has passed its middle position. The rock-lever then occupies the position shown in dot-ted lines in Fig. 1 or" the drawings, in which the circuit is broken. Attention is call d to the fact that the spring of the st rionary contact point follows the rock-lever until the latter reaches its middle position, the contact being then suddenly interrupted, whereby the for mation of an arc is efiectively prevented.

It is to be observed that the outer teeth on the rock-lever constitutes stops, which co-operate with the wedge-shaped projection 24 on the blade-spring, the latter preventing a sudden jar as the rock-lever moves from onev of its extreme positionsto the other one, so that breakage of the lever cannot occur.

, The modification of the invention as illus trated in Figs. 3 and l of the drawings differs from the one above described, in that it is made in the form of a knife-switch, the rock-lever 16 constituting the knife, which co-operates with two stationary contact points 26, each of which is made in the form of a spring. These springs are disposed below the fulcrum 17 of the rock-lever. The current flows in this instance through a short part only of the rock-lever, as clearly appears from Fig. 3 of the drawings.

What I claim is 1. A snap-switch comprising a base, a bar movable on said base in the direction of its longitudinal axis provided with a transverse slot, two stationary contact points on said base, a rock-lever pivoted to said. base eX- tending through said slot and adapted to bridge the gap between said contact points, three wedge-shaped teeth on said rock-lever, and a blade spring on said base provided with a wedge-shaped projection adapted to enter the notches between the teeth on said lever, said spring being placed under tension when its projection is unseated from one of said notches as said lever is by the movement of said bar brought into middle position, whereby said projection is caused to snap into the other notch as soon as said leverhas passed its middle position.

7 2. In a snap-switch according to claim 1, one of said stationary contact points being made in the form of a spring following said lever to its middle position, the contact between said spring and lever being interrupted when said lever passes its middle position.

Signed at Budapest, Hungary, this 6th day of Dec, A. D. 1921.

VIKTOR BUN YEVACZ. 

